DH and I have been married for 18 months and recently been discussing TTC. Due to my work situation (nearly at a very high level in my profession and want to get this before I take time out) we've decided to start TTC after Christmas this year tentatively waves at one MNetter who knows me in RL.
Now, BIL had a bit of a health scare at the start of the year and I think it put his workaholic, money orientated attitude into perspective. So, very excitingly, he has recently got engaged to his long term girlfriend. She is half French and they have been talking about getting married in a chateau and that they would quite like an autumn wedding.
Now, pure speculation here, but seeing as the normal time to plan a wedding seems to be about 18 months, I'm guessing they mean Autumn 2015. Which means if we start TTC at Christmas and touch wood all things being well, there is a chance I could be either heavily pregnant or with a newborn. If they confirm the date, I really wouldn't want to delay TTC just in case things aren't as easy as we hope.
Has anyone had any experience of similar family circumstance clashes? I'll optimistically say that I wouldn't mind travelling whilst pregnant but that's very easy to say as someone who has never been so! Should I resign myself to the fact that I may just have to miss it and DH go alone if the timings do align?
My only experience with something similar is when my bridesmaid got married in Italy and her BIL and his wife's due date were at the same time and so they couldn't travel... She was annoyed at them for not 'planning around it' as some of her old friends had traveled over from Australia and were 4months pregnant with DC2, apparently timed so they could still come. 
Aware this is all very hypothetical but would welcome any advice. Trying to 'plan' the best time to have a baby is a laughable concept..!